JPS6115205A - Drawing method of graphic display for numerical controller - Google Patents

Abstract

PURPOSE:To set early an optimum drawing scale by drawing the locus of a tool, etc. in a magnification ratio set temporarily to obtain a desired drawing magnification ratio and drawing the locus of a tool of a program selected by said magnification ratio. CONSTITUTION:An MDI15 is first operated to call a set value alteration screen to a display screen 25 and sets a program number together with a drawing screen, the maximum/mininum drawing values, the drawing start/end blocks, etc. When these setting actions are over, a drawing start key is turned on the MDI 15. Thus a microcomputer 10 decides first the correspondence between the drawing coordinates and the NC command program coordinates according to the set drawing plane and drawing maximum/minimum values. The one block of the NC command program corresponding to a parameter set program number is read out of a CMOS memory 14. The contents of said block are analyzed to calculate the tool locus data. This data is written to a graphic RAM21. This processing is carried out continuously until the program ends. Then the contents of the RAM21 are read out to a control circuit 23, and the tool locus is displayed on a screen 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for drawing a graphic display for a numerical control device, which decodes the contents of an NC command program and draws tool trajectories and the like on a display screen.

Conventional Technology Today's numerical control (NC) devices not only control machine tools using numerical control technology, but also how to easily and reliably create NC command programs or check NC command programs. is an important element.

The drawing function is a technical answer to this problem, but
Various operating methods and functions need to be improved depending on the actual usage pattern.

The drawing function in the NC device is mainly used for the purpose of checking the operating state of the program after editing (creating or modifying) the NC command program. This method is superior to the method of checking by actually operating the machine tool in the following points.

1) Even if there is an error in the NC command program, the machine is not operating, so there is no risk of collision between the machine and the workpiece.

2) Confirmation can be completed in a shorter time by drawing than by actually operating the machine.

3) Since processing can be performed even during drawing, the machine is used more efficiently.

4) By changing the drawing scale, it is possible to draw at any magnification, making it easy to check both the whole and the parts.

By the way, the shape shown by the curve - in FIG.

In order to check the entire tool path of the size, it is necessary to set the scale A so that the entire curve l is included in the screen, but in the case of an unknown NC command program, the drawing axis of the tool path (Fig. In the illustrated example, since the maximum and minimum values on the X and Y axes are unknown, it is difficult to immediately determine the scale A.

Generally, the scale of drawing is done by setting the drawing space (maximum of each drawing space axis, Jl small value) according to the drawing target (NC command program).The conventional method for this is as follows. Such methods are known.

1) The operator judges the contents of the NC command program in advance and sets the maximum and minimum values at the time of drawing.

2) Use the "start auto" function to first have the device itself find the maximum and minimum values of the corresponding program, and then draw at a scale and screen center coordinates that include these maximum and 9 minimum values on the screen. let

3) Give temporary maximum and minimum values and draw them. The operator looks at the results and uses functions such as "enlargement, reduction" and "shape movement" to sequentially determine the optimal setting values.

However, these methods have the following drawbacks.

Disadvantages of Method 1) The operator's analysis of program content is originally a different function from this type of function, as described above. That is,
This is inconsistent with the development direction of reducing the knowledge required for programming and making it easier for even those without specialized training to operate the NC device. Further, even for those who have such knowledge, the task of finding the maximum and minimum values is complicated, and it is virtually impossible to attempt it for a long NC command program. Therefore, this method can only be applied when the maximum and minimum values are already known or when the program is extremely simple.

Disadvantages of method 2) The most reliable method is to have the device itself find the maximum and minimum values. However, for this purpose, it is necessary to run the program once just to know the drawing range, which generally takes a time comparable to the drawing time.

For this reason, a long NC command program takes a long time to start drawing, making it impractical.

Disadvantages of method 3) The method of drawing without scattering using temporary setting values is a method that is often used in practice. In this case, scale C in Figure 3
If even a small figure is drawn on the screen, it is often possible to set good settings for the next drawing. In particular, in the case of an NC device, since the program command does not exceed the movable range of the machine tool to be controlled, the value may be set as a temporary setting value. However, if the temporary setting values are inappropriate and, for example, as in scale B in FIG. 3, little or no figure is displayed on the screen, the drawing will be completely wasted.

Problems to be Solved by the Invention The present invention solves these conventional problems, and its purpose is to enable the optimum drawing scale to be set as early as possible.

Means for Solving the Problems In order to solve the above problems, the present invention selects a drawing method for a graphic display for a numerical control device that decodes the contents of an NC command program and draws tool trajectories, etc. on a display screen. First, the center coordinates of the drawing screen with a drawing magnification of 5 are determined so that the maximum coordinate value and minimum coordinate value given by the key input means fit within the screen, and the drawing screen center coordinates are drawn using this Ffti image. In parallel, the maximum and minimum coordinate values of the selected NC command program are calculated, and when a predetermined command is input after the drawing is completed, the maximum coordinate value and minimum coordinate value calculated above are displayed on the screen. The drawing magnification and center coordinates of the drawing screen are found to fit, and the tool locus, etc. of the selected program is drawn accordingly.

Operation If the temporary maximum coordinate value 2 minimum coordinate value initially given by the key input means are appropriate setting values corresponding to the selected NC command program, a satisfactory drawing result will be obtained in the first drawing. If the setting values are inappropriate, in the worst case, the tool path etc. will not be displayed on the screen at all, but during this drawing, the maximum and minimum coordinate values of the relevant NC command program are determined. Therefore, when a predetermined command is input next time and the drawing is performed again, the drawing magnification is such that the obtained maximum and minimum coordinate values fit within the screen.

The tool trajectory, etc. is drawn at the center coordinates of the drawing screen, and at least 2
At the same time, it is possible to reliably draw the entire tool trajectory, etc.

Embodiment FIG. 2 is a block diagram of a main part of a numerical control device having a graphic display that implements the present invention. IO is a microcomputer, and peripheral circuits are interconnected through buses including a data bus, an address bus, and a control bus. Connected. Further, 11 is a ROM that stores programs necessary for the microcomputer 10 to execute predetermined operations, and 12 is a RAM that is used for pointers, calculations, etc.
13 is an address decoder for accessing a memory, etc.; 14 is a CMOS memory for storing an NC command program; and 15 is a manual decoder input device (MDI) provided on the front panel of the NC device, which has various keys.

16 is a CRT controller that generates horizontal and vertical synchronizing signals and scanning addresses; 17 is a pulse oscillation circuit; 18
19 is an address decoder, 20 is a character RAM that stores display characters corresponding to the position of the display screen, and 21 corresponds to each display dot on the screen. Graphic RAM with storage area for
, 22 is a character generator ROM that converts the output of the character RAM 20 into character pattern data.
3 is character RAM 20. 24 is a display unit, and 25 is a display screen.

A plurality of NC command programs are stored in the CMOS memory 14, and which program's tool locus is to be drawn is designated by changing set values. To change the set value, press the set value change key on the MD115 as is well known, to display the set value change screen on the display screen 25, and enter the number of the program you want to display from the MD115 in the program number insertion place on the set value change screen. This is done by writing . The setting value change screen also has areas for setting parameters related to the drawing plane, maximum and minimum values for drawing, parameters related to screen center coordinates, parameters related to the drawing start point, drawing start block, final project, etc. Yes, set the necessary data for these from MDI+5. Here, for the parameters related to the drawing plane, for example, if the tool path is to be displayed on the XY plane, the number of the XY plane is set to 0, for example, and when it is desired to be displayed on the YZ plane, it is set to l.

Furthermore, the maximum and minimum values for each axis of the specified plane are set as the maximum and minimum values for drawing. If the maximum and minimum values are set like this, this maximum value.

The scale and screen center coordinates are automatically determined so that the minimum value fits within the screen. The screen center coordinates are the forces set by the values in the workpiece coordinate system in the NC command program that attempts to draw the center coordinates of the screen. If the maximum and minimum values are set, the center of these maximum and minimum values is Automatically set as screen center coordinates. If G92 is not commanded at the beginning of the NC command program to be drawn, this setting value will be the starting position.
If there is no command such as G92, set it in the work coordinate system. Also, in the drawing start block and end block,
Specify the start and end blocks of drawing by specifying the program number and sequence number.

Next, the operation of this embodiment will be explained. For example, CMOS memo 1
To display the tool path of program number 11 ONC command program stored in month 5 on the display screen 25, first operate the MD 115 to call up the set value change screen on the display screen B, set No. 1 as the program number, and Set the drawing plane, drawing maximum value, minimum value, drawing start block, final block, etc. In this case, the drawing maximum and minimum values are set to temporary maximum and minimum values that the operator determines to be appropriate. When necessary parameter settings are completed, the drawing start key on the MD 115 is turned on. As a result, the microcomputer 10 executes the processing shown in FIG.

That is, first, the correspondence between the drawing coordinates and the NC command program coordinates (scale, drawing center coordinates, etc.) is determined according to the set drawing plane, maximum value, and minimum value. Make preparations (for example, use temporary maximum and minimum values set as parameters as the coordinates of the starting point, etc.).

Next, write one block of the NC command program corresponding to the parameter-set program number in the CMOS memo.
The tool path data is calculated by reading from and analyzing the contents.
The data is written into the graphic RAM 21. Furthermore, the position in the program coordinates is updated according to the program contents, and the maximum and minimum values of the program are calculated for each axis by comparing with the past maximum and minimum values. In addition, in the figure, MAX (a, b
) indicates the larger one of a and b, and MIN (a, b) indicates the smaller one. Such processing continues until the specified NC command program is completed.

When the above processing is completed to the end of the NC command program,
The tool trajectory on the temporary scale of the specified NC command program is stored in the graphic RAM 2], and the microcomputer 1o changes the contents of the graphic RAM 2 by switching the address switching circuit 18 to the scanning address side. The display control circuit sequentially reads out the tool locus and displays it on the display screen 25.

If the operator is satisfied with this display screen,
You can check the program while looking at the display screen. Also, the temporary maximum value.

Because the minimum value setting is inappropriate, nothing is displayed on the screen, or even if something is displayed, the necessary part is not displayed, or the necessary part is displayed but the appropriate maximum and minimum values are not displayed. If it is difficult to obtain the values, press the automatic drawing key MD (15), and as shown in the flowchart in Figure 1, the maximum and minimum values obtained during the previous drawing will be displayed in the official format. maximum.

Since the drawing process is performed using the minimum set value, the tool trajectory, etc., will be drawn at a drawing magnification that allows the entire tool trajectory of the specified NC command program to fit within the screen, and at the center coordinates of the drawing screen.

Furthermore, if it is possible to select conventional methods 1 to 3 after the first drawing (however, selecting method 2 is practically meaningless), the degree of freedom in operation will be greater. It is suitable.

As described in detail, according to the present invention, the temporary maximum coordinate value and minimum coordinate value initially given by the key input means are the selected N.
If it is a consistent setting value that corresponds to the C command program, it is 1.
You will be able to get a satisfactory drawing result on the second drawing,
Furthermore, even if the setting values are inappropriate, if some tool path is displayed, the operator can obtain some information about the program, and the
Since the maximum coordinate value and i-stop coordinate value of the command program have been determined, the next time a predetermined command is input and drawing is performed again, the determined maximum coordinate value will be used.

The drawing magnification allows the minimum coordinate value to fit within the screen, and the tool path, etc. is drawn using the center coordinates of the drawing screen, making it possible to reliably draw the entire tool path, etc., and the optimal drawing scale as a whole can be drawn as early as possible. It becomes possible to set.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing the processing flow of the method according to the embodiment of the present invention, Fig. 2 is a block diagram of main parts of a numerical control device implementing the invention, and Fig. 3 explains the relationship between the tool trajectory to be drawn and the screen scale. This is a diagram. 10 is a microcomputer, 11 is a ROM, 12 is an R
AM, 14 is a CMOS memory that stores the NC command program, 15 is MDI, 16 is a CRT controller, 21
2 is a graphic RAM, 24 is a display unit, and 25 is a display screen.

Claims (1)

[Claims] In a drawing method for a graphic display for a numerical control device that decodes the contents of an NC command program and draws a tool trajectory, etc. on a display screen, the tool trajectory, etc. of a selected NC command program is first displayed in the maximum coordinates given by the key input means. value, the drawing magnification at which the minimum coordinate value fits within the screen,
In addition to determining the center coordinates of the drawing screen and drawing using these coordinates, in parallel with the drawing process, the maximum and minimum coordinate values of the selected NC command program are determined, and when a predetermined command is input after the drawing is completed, , a graphic for a numerical control device, characterized in that the drawing magnification and the center coordinates of the drawing screen are determined so that the maximum coordinate value and the minimum coordinate value obtained above are within the screen, and the tool path, etc. of the selected program is drawn in accordance with the drawing magnification and drawing screen center coordinates. How to draw the display.